Jelinek cork quarter round cork blocks are made of all-natural, sustainable cork. Cork has many natural characteristics - light in weight, soft to the touch, durable, warm - that make it the ideal material for exercise, Pilates and yoga props and tools. The natural texture and flexibility of cork creates a non-slip surface and provides optimum comfort and support during exercise and poses. This versatile yoga prop can be used in poses which put pressure on your joints to help you get more out of your stretch. Dimensions: 9" x 3-3/4" x 3-3/4" (22.85 x 9.53 x 9.53cm) 100% all-natural cork Sturdy & durable Excellent traction & stability Adds comfort and support Easy to grip